Error #1034: Type Coercion failed

[COLOR=black][FONT=Verdana]Hello all,[/FONT][/COLOR]
[COLOR=black][FONT=Verdana]I have an Issue I can use some help with… I have a flex file I am trying to load into a game. the projected .swf file works perfect on its own however when I load it into the main file i get:[/FONT][/COLOR]
[COLOR=black][FONT=Verdana] [/FONT][/COLOR]
[COLOR=black][FONT=Verdana]TypeError: Error #1034: Type Coercion failed: cannot convert [COLOR=#22229c]NetworkingPretest@3857161[/COLOR] to mx.core.IUIComponent.
at mx.managers::SystemManager/initializeTopLevelWindow()
at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::docFrameHandler()
at mx.managers::SystemManager/docFrameListener()
Cannot display source code at this location.[/FONT][/COLOR]
[COLOR=black][FONT=Verdana] [/FONT][/COLOR]
[COLOR=black][FONT=Verdana]This has been driving us crazy… we do have the source and can do what’s necessary or any recomendations… The file was written a while back by someone else…[/FONT][/COLOR]
[COLOR=black][FONT=Verdana] [/FONT][/COLOR]
[COLOR=black][FONT=Verdana]Any help would be greatly appreciated.[/FONT][/COLOR]
[COLOR=black][FONT=Verdana] [/FONT][/COLOR]
[COLOR=black][FONT=Verdana]flash_back[/FONT][/COLOR]